Correct extraction of the ultra-large-scale integrated (ULSI) interconnect components at hight frequencies is very important for evaluating electrical performances of high-speed ULSI circuits.In this paper, the extrac...Correct extraction of the ultra-large-scale integrated (ULSI) interconnect components at hight frequencies is very important for evaluating electrical performances of high-speed ULSI circuits.In this paper, the extraction of the interconnect resistance at high frequencies is derived from the Ohm′s law and verified by the software FastHenry.The results are also compared with those of another resistance formula originated from the effective area of the current flowing. The applicability of these two formulae is discussed.The influence of the interconnect geometry on the resistance at high frequencies is studied.The computation indicates that the effect of frequency on the resistance is weak when the skin depth is larger than half of the short side of the rectangular interconnect cross section.With further increase of frequency, the resistance increases obviously. Results imply that conductor with a square cross section exhibits the largest resistance for rectangular conductors of constant cross section area.展开更多
Projection welding is a variation of electric resistance welding with the dynamic changes of the flow paths for heat and electrical properties with changing temperature caused by the large plastic deformation collapse...Projection welding is a variation of electric resistance welding with the dynamic changes of the flow paths for heat and electrical properties with changing temperature caused by the large plastic deformation collapse of projection. As the joint type between the auto door hinge and the inner plate, projection welding may bring welding distortions and would affect the assembly quality of auto body. A comprehensive electric-thermal-mechanical numerical simulation was performed to quantitatively simulate the processes of projection welding by using a coupled finite element method. The mechanism of projection collapse and the formation process of nugget were discussed and good conclusions have been achieved comparing with the test results.展开更多
文摘Correct extraction of the ultra-large-scale integrated (ULSI) interconnect components at hight frequencies is very important for evaluating electrical performances of high-speed ULSI circuits.In this paper, the extraction of the interconnect resistance at high frequencies is derived from the Ohm′s law and verified by the software FastHenry.The results are also compared with those of another resistance formula originated from the effective area of the current flowing. The applicability of these two formulae is discussed.The influence of the interconnect geometry on the resistance at high frequencies is studied.The computation indicates that the effect of frequency on the resistance is weak when the skin depth is larger than half of the short side of the rectangular interconnect cross section.With further increase of frequency, the resistance increases obviously. Results imply that conductor with a square cross section exhibits the largest resistance for rectangular conductors of constant cross section area.
基金The National Natural Science Foundation of China(No.50575140)
文摘Projection welding is a variation of electric resistance welding with the dynamic changes of the flow paths for heat and electrical properties with changing temperature caused by the large plastic deformation collapse of projection. As the joint type between the auto door hinge and the inner plate, projection welding may bring welding distortions and would affect the assembly quality of auto body. A comprehensive electric-thermal-mechanical numerical simulation was performed to quantitatively simulate the processes of projection welding by using a coupled finite element method. The mechanism of projection collapse and the formation process of nugget were discussed and good conclusions have been achieved comparing with the test results.
